What steps does coating pretreatment need?

There are two ways of coating, one is to apply photosensitive emulsion on the screen through multiple wet pressing operations, or to add drying process after each coating. A machine for quantitatively coating liquid (or melt) polymer materials such as adhesives or coatings on the surface of materials.

Suitable for the production of PVC / PE film and other soft base materials

Working principle of automatic coater: the working principle of automatic coater for screen printing is the same, but its performance is different according to different models and different manufacturers. The vertical frame of the screen coater is provided with a device for clamping the screen frame. The front and back of the screen area is a horizontal coating mechanism, which is composed of a coating groove, a mechanical part or a pneumatic part controlling the angle and pressure of the coating groove.

Two ends of the coating mechanism are installed on the vertical support arm of the coating machine, and the coating mechanism moves up and down through the transmission of the belt, chain or cable, and is coated along the surface of the screen. The transmission mechanism is connected to the servo or frequency conversion motor to make its operation stable and to accurately control the position of the coating mechanism.

Before coating, the clean and stretched screen will be installed from the front of the coater, and some models can also be installed from the side. In the model designed for large format mesh frame, side mounting is more common, because the mesh frame is large and bulky, and side mounting can reduce the lifting and moving amount. When the automatic screen coater is on line with other automatic screen processing equipment (such as cleaning equipment, regeneration equipment, drying device and developer), it is more convenient to install the plate from the side.

No matter how the screen is installed, once the screen is in the right position, the coater manufacturer said that the pneumatic clamping device or mechanical clamping device will be closed to lock the screen. In order to operate more convenient, many models have foot pedal control version clip action, operators can free up their hands to control the screen. After the screen is installed, the coating can be started after the corresponding photosensitive emulsion is filled into the automatic coater. According to the functions of the control system and the equipment, the equipment can coat both sides of the screen at the same time.